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Attack Disrupts Web Sites

By

Geoffrey A. Fowler

Updated Dec. 24, 2009 10:22 a.m. ET

Multiple Internet sites, including those run by Amazon.com Inc., were temporarily disrupted for some Web users after a company that provides them directory services suffered what it called a "denial of service" attack.

Neustar Inc., which runs the UltraDNS service that helps process the connections between individual computers and Web sites, says the disruption lasted about an hour and only affected Web users in Northern...